Electrodeposition of NiSn-rGO Composite Coatings from Deep Eutectic Solvents and Their Physicochemical Characterization

The present work describes, for the first time, the electrodeposition of NiSn alloy/reduced graphene oxide composite coatings (NiSn-rGO) obtained under pulse current electrodeposition conditions from deep eutectic solvents (choline chloride: ethylene glycol eutectic mixtures) containing well-dispersed GO nanosheets. The successful incorporation of the carbon-based material into the metallic matrix has been confirmed by Raman spectroscopy and cross-section scanning electron microscopy (SEM). A decrease in the crystallite size of the coating was evidenced when graphene oxide was added to the electrolyte. Additionally, the topography and the electrical properties of the materials were investigated by atomic force microscopy (AFM). The corrosion behavior in 0.5 M NaCl solution was analyzed through potentiodynamic polarization and electrochemical impedance spectroscopy methods for different immersion periods, up to 336 h, showing a slightly better corrosion performance as compared to pure NiSn alloy.

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Photocatalytic reduction of graphene oxide with cuprous oxide film under UV-vis irradiation

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2020-0022 ◽

2020 ◽

Vol 59 (1) ◽

pp. 207-214 ◽

Cited By ~ 1

Author(s):

Yao Wang ◽

Jianqing Feng ◽

Lihua Jin ◽

Chengshan Li

Keyword(s):

Graphene Oxide ◽

Photoelectron Spectroscopy ◽

Low Cost ◽

Photocatalytic Reduction ◽

Force Microscopy ◽

Atomic Force ◽

Reduced Graphene ◽

Reduction Efficiency ◽

Metal Organic ◽

Reduction Effect

AbstractWe have grown Cu2O films by different routes including self-oxidation and metal-organic deposition (MOD). The reduction efficiency of Cu2O films on graphene oxide (GO) synthesized by modified Hummer’s method has been studied. Surface morphology and chemical state of as-prepared Cu2O film and GO sheets reduced at different conditions have also been investigated using atomic force microscopy (AFM) and x-ray photoelectron spectroscopy (XPS). Results show that self-oxidation Cu2O film is more effective on phtocatalytic reduction of GO than MOD-Cu2O film. Moreover, reduction effect of self-oxidation Cu2O film to GO is comparable to that of environmental-friendly reducing agent of vitamin C. The present results offer a potentially eco-friendly and low-cost approach for the manufacture of reduced graphene oxide (RGO) by photocatalytic reduction.

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Mechanical Characterization of Reduced Graphene Oxide Using AFM

Advances in Condensed Matter Physics ◽

10.1155/2019/8713965 ◽

2019 ◽

Vol 2019 ◽

pp. 1-13 ◽

Cited By ~ 5

Author(s):

Alem Teklu ◽

Canyon Barry ◽

Matthew Palumbo ◽

Collin Weiwadel ◽

Narayanan Kuthirummal ◽

...

Keyword(s):

Atomic Force Microscopy ◽

Graphene Oxide ◽

Young’S Modulus ◽

Reduced Graphene Oxide ◽

Young's Modulus ◽

Force Microscopy ◽

Atomic Force ◽

Reduction Cycle ◽

Reduced Graphene ◽

Oxide Sample

Nanoindentation coupled with Atomic Force Microscopy was used to study stiffness, hardness, and the reduced Young’s modulus of reduced graphene oxide. Oxygen reduction on the graphene oxide sample was performed via LightScribe DVD burner reduction, a cost-effective approach with potential for large scale graphene production. The reduction of oxygen in the graphene oxide sample was estimated to about 10 percent using FTIR spectroscopic analysis. Images of the various samples were captured after each reduction cycle using Atomic Force Microscopy. Elastic and spectroscopic analyses were performed on the samples after each oxygen reduction cycle in the LightScribe, thus allowing for a comparison of stiffness, hardness, and the reduced Young’s modulus based on the number of reduction cycles. The highest values obtained were after the fifth and final reduction cycle, yielding a stiffness of 22.4 N/m, a hardness of 0.55 GPa, and a reduced Young’s modulus of 1.62 GPa as compared to a stiffness of 22.8 N/m, a hardness of 0.58 GPa, and a reduced Young’s modulus of 1.84 GPa for a commercially purchased graphene film made by CVD. This data was then compared to the expected values of pristine single layer graphene. Furthermore, two RC circuits were built, one using a parallel plate capacitors made of light scribed graphene on a kapton substrate (LSGC) and a second one using a CVD deposited graphene on aluminum (CVDGC). Their RC time constants and surface charge densities were compared.

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Investigation into morphological and electromechanical surface properties of reduced-graphene-oxide-loaded composite fibers for bone tissue engineering applications: A comprehensive nanoscale study using atomic force microscopy approach

Micron ◽

10.1016/j.micron.2021.103072 ◽

2021 ◽

Vol 146 ◽

pp. 103072

Author(s):

Adrian Chlanda ◽

Ewa Walejewska ◽

Krystian Kowiorski ◽

Marcin Heljak ◽

Wojciech Swieszkowski ◽

...

Keyword(s):

Tissue Engineering ◽

Atomic Force Microscopy ◽

Graphene Oxide ◽

Bone Tissue Engineering ◽

Bone Tissue ◽

Reduced Graphene Oxide ◽

Surface Properties ◽

Force Microscopy ◽

Atomic Force ◽

Reduced Graphene

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Graphene Oxide Coatings Deposited on Steel Substrate Using Electrophoretic Deposition and Electrochemical Evaluation of Coatings in Saline Media

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.778.111 ◽

2018 ◽

Vol 778 ◽

pp. 111-117 ◽

Cited By ~ 1

Author(s):

Zaeem Ur Rehman ◽

Mohsin Ali Raza ◽

Faizan Ali Ghauri ◽

Rumasa Kanwal ◽

Akhlaq Ahmad ◽

...

Keyword(s):

Graphene Oxide ◽

Mild Steel ◽

Electrophoretic Deposition ◽

Electrochemical Impedance ◽

Steel Substrate ◽

Charge Transfer Resistance ◽

Transfer Resistance ◽

Force Microscopy ◽

Atomic Force ◽

Heat Treated

In this study graphene coatings were deposited on mild steel substrate using feasible and environmental friendly method. The successful synthesis of graphite oxide was carried by the modified Hummer’s method. Graphene oxide (GO) coatings were developed from GO/water suspension using electrophoretic deposition (EPD). The EPD parameters voltage and deposition time were varied to deposit uniform adherent coatings. The coatings were post heat treated at 200 °C in vacuum for 4h to assess the effect on coated samples. GO and GO-EPD coating morphology were characterized using Fourier transform infrared spectroscopy (FTIR), Atomic force microscopy (AFM) and Scanning electron microscopy (SEM). Linear polarization (LPR) and electrochemical impedance spectroscopy (EIS) tests were performed in saline solution to evaluate electrochemical response. Coatings were partially reduced due to removal of oxygen containing functional groups during EPD and post heat treatments. The GO post heat treated coating had better corrosion resistance ~2 times than that of bare mild steel and higher charge transfer resistance.

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Tetrachloroperylene diimide functionalized reduced graphene oxide sheets and their I–V behavior by current sensing atomic force microscopy

Journal of Materials Chemistry ◽

10.1039/c2jm34379g ◽

2012 ◽

Vol 22 (36) ◽

pp. 18839 ◽

Cited By ~ 10

Author(s):

Zhongjie Ren ◽

Dianming Sun ◽

Jianming Zhang ◽

Shouke Yan

Keyword(s):

Atomic Force Microscopy ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Current Sensing ◽

Force Microscopy ◽

Atomic Force ◽

Reduced Graphene ◽

Graphene Oxide Sheets

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First investigation of liposomes behavior and phospholipids organization in choline chloride-based deep eutectic solvents by atomic force microscopy

Journal of Molecular Liquids ◽

10.1016/j.molliq.2020.112851 ◽

2020 ◽

Vol 306 ◽

pp. 112851 ◽

Cited By ~ 1

Author(s):

Jad Eid ◽

Tracy El Achkar ◽

Sophie Fourmentin ◽

Hélène Greige-Gerges ◽

Alia Jraij

Keyword(s):

Atomic Force Microscopy ◽

Choline Chloride ◽

Deep Eutectic Solvents ◽

Force Microscopy ◽

Atomic Force

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Enhancement of barrier and anti-corrosive performance of zinc-rich epoxy coatings using nano-silica/graphene oxide hybrid

Corrosion Reviews ◽

10.1515/corrrev-2020-0034 ◽

2020 ◽

Vol 38 (6) ◽

pp. 497-513

Author(s):

Meiling Zhang ◽

Hui Wang ◽

Ting Nie ◽

Jintao Bai ◽

Fei Zhao ◽

...

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Corrosion Protection ◽

Electrochemical Impedance ◽

Epoxy Coating ◽

X Ray Diffraction ◽

Protection Efficiency ◽

Force Microscopy ◽

Atomic Force ◽

Transmission Electron

AbstractThis study reports a facile method to prepare silica-coated graphene oxide nanoflakes (SiO2–GO). Results of X-ray diffraction analysis, Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and atomic force microscopy reveal that silica was successfully coated on the GO flakes. The effect of SiO2–GO nanosheets on the corrosion protection and barrier performance of the epoxy coating was investigated in this work. Results indicate that the mechanical properties of all coatings added with GO and SiO2–GO were significantly improved. Furthermore, electrochemical impedance and Tafer polarisation curves showed that added 0.5 wt% SiO2–GO nanoflakes into zinc-rich epoxy coating could greatly improve the anti-corrosion performance of the sample, and the corrosion protection efficiency increased from 67.01 to 99.58%.

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Synthesis of Graphene Oxide Nanoparticles by Laser Ablation System

Iraqi Journal of Science ◽

10.24996/ijs.2020.61.9.11 ◽

2020 ◽

pp. 2241-2250

Author(s):

Atiaf K. Jeryo ◽

Qusay Adnan Abbas

Keyword(s):

Magnetic Field ◽

Graphene Oxide ◽

X Ray Diffraction ◽

Force Microscopy ◽

Fundamental Wavelength ◽

Atomic Force ◽

Pure Graphite ◽

Reduced Graphene ◽

Stretching Vibration ◽

Pulse Energies

In this study, graphene oxide (GO) and reduced graphene oxide were synthesized by pulsed Nd:YAG laser with a fundamental wavelength (1064 nm) focused on the pure graphite target which was immersed in distilled water. Different pulse energies were applied in two cases; with and without magnetic field. The synthesized GO and rGO nanoparticles were characterized by UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM) with and without magnetic field. The data show the presence of a magnetic field which illustrated increasing oxygen functional groups of GO. This caused a change in the morphology of the surface of GO, increasing crystallite size from 12.19 nm to 71.2 nm. The interlayer distance (d-space) was reduced from 0.4 nm to 0.25 nm and the absorption peaks that appeared in the spectrum were reduced and shifted toward smallest wavelengths, while the stretching vibration of the O-H group peak was shifted toward largest wavelengths.

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Using Deep Eutectic Solvent for Conjugation of Fe3O4 Nanoparticles onto Graphene Oxide for Water Pollutant Removal

10.26434/chemrxiv.12089658.v1 ◽

2020 ◽

Author(s):

Novin Mehrabi ◽

Umar Faruq Abdul Haq ◽

M. Toufiq Reza ◽

Nirupam Aich

Keyword(s):

Graphene Oxide ◽

Metallic Nanoparticles ◽

Carbon Nanomaterials ◽

Organic Dyes ◽

Choline Chloride ◽

Physicochemical Characterization ◽

Deep Eutectic Solvent ◽

Deep Eutectic Solvents ◽

Pollutant Removal ◽

Hydrogen Bond Donor

Deep eutectic solvents (DESs) have emerged as a substitute for ionic liquids with lower cost and enhanced biodegradability. The most common class of DES refers to a mixture of a quaternary ammonium or phosphonium salt and a hydrogen bond donor (e.g., carboxylic acid) with a melting point lower than that of individual components. DESs have recently shown promise for surface modification of graphene oxide (GO) nanosheets with different functional groups. We hypothesize that such surface functionalization of GO (and other carbon nanomaterials) with DESs can provide a new route to conjugate metallic nanoparticles onto GO surfaces (and similar). Here, we used a typical DES, based on choline chloride and urea, for the conjugation of presynthesized Fe3O4 nanoparticles onto GO nanosheets at different GO:Fe3O4 ratios. Physicochemical characterization not only confirmed the ability of DES to prepare DES/GO-Fe3O4 nanohybrids successfully, but also evidenced the influence of DES on the homogeneity and size distribution of Fe3O4 nanoparticles in these nanohybrids. DES/GO-Fe3O4 nanohybrids can perform better than both GO and Fe3O4 as adsorbents for organic dyes (methylene blue, MB) and heavy metals (Lead (II)). However, depending on the contaminant type, the contaminant removal performance varied differently for DES/GO-Fe3O4 nanohybrids with different ratios.

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